This changes ProjectsFinder#init_collection so it no longer relies on a
UNION. For example, to get starred projects of a user we used to run:
SELECT projects.*
FROM projects
WHERE projects.pending_delete = 'f'
AND (
projects.id IN (
SELECT projects.id
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
INNER JOIN project_authorizations
ON projects.id = project_authorizations.project_id
WHERE projects.pending_delete = 'f'
AND project_authorizations.user_id = 1
AND users_star_projects.user_id = 1
UNION
SELECT projects.id
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
WHERE projects.visibility_level IN (20, 10)
AND users_star_projects.user_id = 1
)
)
ORDER BY projects.id DESC;
With these changes the above query is turned into the following instead:
SELECT projects.*
FROM projects
INNER JOIN users_star_projects
ON users_star_projects.project_id = projects.id
WHERE projects.pending_delete = 'f'
AND (
EXISTS (
SELECT 1
FROM project_authorizations
WHERE project_authorizations.user_id = 1
AND (project_id = projects.id)
)
OR projects.visibility_level IN (20,10)
)
AND users_star_projects.user_id = 1
ORDER BY projects.id DESC;
This query in turn produces a better execution plan and takes less time,
though the difference is only a few milliseconds (this however depends
on the amount of data involved and additional conditions that may be
added).
When a VisibilityLevel is an integer formatted as a string, convert it
to an integer, instead of looking it up in the hash map.
When the value is not recognized, default to PRIVATE.
